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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42bb71d26a0603bb29d19d44a4b86e98e5cb1f70f1242e6774bf08e030bf62f7' 
  AND token = 'SwMvCl2UsvHcho1pctf9OATTuouiw1V5OwopxR+0Krc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}